Dr. Jen's Informed Consent Club on ClubhousePubMed studies:IgG antibody persistence https://pubmed.ncbi.nlm.nih.gov/33033172/NIH article:https://www.nih.gov/news-events/nih-research-matters/lasting-immunity-found-after-recovery-covid-19"As with antibodies, the numbers of different immune cell types varied substantially between individuals. Neither gender nor differences in disease severity could account for this variability. However, 95% of the people had at least 3 out of 5 immune-system components that could recognize SARS-CoV-2 up to 8 months after infection."Vaccine antibody articlehttps://www.aarp.org/health/conditions-treatments/info-2021/covid-vaccine-immunity-duration.html